hey im building my 350 up and a guy at work has a edelbrock 1405 600 cfm carb...you think that will work good or i have my 750 holley...the 600 is use but looks fairly clean. it rubed clean by using my thumb and rubbing on it. he said he would sell it cheap? 50 sound like a good offer?

600 is far better than 750 on a 350.

I second the 600.

I run the Edelbrock 1406 on my 350 bird. It works but there is a A/F restrictor plate that is designed for "smooth transition from primary to secondary"and are calibrated for economy, not performance. I don't like the poor acceleration when I punch it. You don't get the power when the 4 barrels kick in. If I was to do it over again I would get the Thunder series AVS 1806 series or stay with a Quadrajet.
http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_app_chart.pdf

Brent B

Neither will give the driveability, performance, or economy of the original Q-Jet.

Jon.

Ruff.-The holley is too big for a 350 and its a square bore carb, I dont think it will fit a stock manifold. The Edelbrock tunes more easily and it wont leak like a old Holly or Q.jet.My two cents is get a proffesionaly set up Q-jet and save your grief for something else!!-MIK

Remember , when it comes to carbs , bigger isnt always better....

the 600 is the good choice unless you are planing to do some serious modifications (bigger cam, bigger valves etc.)

cfm = ( CI x ERPM x VE ) / 3456

CI = Cubic Inch fo Motor
ERPM = Engine Red Line
VE = Volumetric Effieciency (approx 85% for stock)

If the number is in between 2 sizes, error on the low side. You may sacrafice a tiny bit in overall horseepower at the high end, but you will gain drivability at all speeds.